By noon she was half way of her distance.  The sun was hot; summer baking of the desert had begun.  Her mare was sweating profusely.  She had urged her to the top of her strength.  Nevertheless she was still in excellent condition.  To the westward the sky was overcast in a manner such as Beth had never seen, with a dark, copperous storm-head that massed itself prodigiously above the range.

Already she had come to three branchings of the road and chosen her way in confidence, according to Billy Stiff’s directions.  When she came to a fourth, where none had been indicated, she was sure, either in Billy’s instructions, or upon his drawing, she confessed herself somewhat uncertain.  She halted and felt for the map.

It was not to be found.  She had left it behind at Mrs. Dick’s.  Dimly she fancied she remembered that Billy had said on the fourth branch, keep to the right.  There could be no doubt that this branch was the fourth, howsoever out of place it appeared.  She rode to the right, and, having passed a little valley, found herself enfolded in a rolling barrier of hills where it seemed as if the sun and rocks were of almost equal heat.

At mid-afternoon Beth abruptly halted her pony and stared at the world of desert mountains in confusion not unmixed with alarm.  She was out at the center of a vast level place, almost entirely devoid of vegetation—­and the road had all but disappeared.  It branched once more, and neither fork was at all well defined, despite the fact that travel to Starlight was supposed to be reasonably heavy.  She had made some mistake.  She suddenly remembered something that Billy had said concerning a table mountain she should have passed no later than half-past one.  It had not been seen along her way.  She was tired.  Weariness and the heat had broken down a little of the bright, joyous spirit of the morning.  A heart-sinking came upon her.  She must turn and ride back to—­she knew not which of the branches of the road, any one of which might have been wrongly selected.

Her mare could not be hurried now; she must last to get her to Starlight.  To add to other trifles of the moment, the bank of cloud, so long hung motionless above the western summits, moved out across the path of the sun and blotted out its glory with a density that would have seemed impossible.

Scarcely had Beth fairly turned her back to the west when a wind storm swooped upon the desert.  It came as a good stiff breeze, at first, flecking up but little of the dust.  Then a sudden, ominous change occurred.  All the blue of the sky was overwhelmed, under a sudden expansion of the copperous clouds.  An eclipse-like darkness enveloped the world, till the farthest mountains disappeared and the near-by ranges seemed to magnify themselves as they blended with the sky.

With a sound as of an on-rushing cataclysm the actual storm, cyclonic in all but the rotary motion, came beating down upon the startled earth like a falling wall of air.